HYDROCHEMICAL AND TOXICOLOGICAL COMPOSITION IN TECHNOGENIC LAKES OF MALE POLISSYA IN UKRAINE

The article presents the research results of hydrochemical indicators and assessment phytotoxic conditions (heavy metals content) in inactive water-filled sandpit (technogenic lakes) in the area of Male Polissya of Ukraine. Determined that these new man-made elements hydrographic network of have allowable values hydrochemical parameters and heavy metals in water and pit-bottom sediments, therefore suitable for recreational use. Extraction of mineral resources by opencast methods involve violations of lithogenic base of the landscape, changing the hydrological regime, and thus the destroying of natural ecosystems. The physical-geographical area of Male Polissya is located between Volhynia forest-steppe sublimity in the north, Roztochchyam north-west and by Podil'skoy forest-steppe sublimity on a southeast. Stretched out from Zhytomyr part of Ukrainian Polissya on east to Rava-Ruska on a west and farther passes to territory of Poland. A special feature of the sand extraction in the eastern part of Male Polissya is development of water-filled pits, which initially had the sand extraction from the surface layer, and then, when the pit depth reached groundwaters level and the pit got gradually filled with them - from the water layers with the help of dredges. The objects of the research are man-made water body that were formed in the eastern part of the Male Polissya from the late 60-ies of the 20^th century during active development of the area as a resource base for sand extraction for the needs of the construction industry. At present, most of the water-filled sand pits are not being developed and essentially they are man-made lakes. They differ from natural lakes by the structure of the bottom and littoral zone, as in the formation of them the leading role was played by not natural, but technological and economic factors of pit
development. The considerable depth of these lakes (5-25 m) and low levels of
suspended solids in the water makes it blue color, so that local people often call cascades of these reservoirs "Blue Lakes".

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1.  Didukh O.I.: Formation of hydrochemical parameters in artificial lakes (on the example of
     Javoriv Lake). First Ukrainian Meeting of the Ecologists (ECOLOGY-2006): Abstracts from
     the International Scientific Conference, О.І. Didukh, М.S. Malyovany (ed.). Vinnytsya October
     4-7, 2006, UNIVERSUM-Vinnytsya 2006.

2.  Kasztelewicz Z.: Poprawianie krajobrazu. Rekultywacja terenów pogórniczych w polskich
     kopalniach odkrywkowych. Cz. II. Surowce i Maszyny Budowlane, 1, 2011, 73-74.

3.  Kucheryavy V.P.: Reclamation and fitomelioration. Manual. V.P. Kucheryavy, Y.V. Genyk,
     А.P. Dyda, М.М. Kolodko (ed.). Svit, Lviv 2006.

4.  Zylov E.A.: Hydrobiology and water Ecology (organization, functioning and pollution of
     ecosystems): training manual. Publishing house of Irkutsk State University, Irkutsk 2009.

5.  Kucheryavy V.P.: General Ecology. Svit, Lviv 2010.

6.  Krot Y.G.: Using of up-water aquatic plants in biotechnology for cleaning of upper waters and  
     sewage waters. Hydrobiological Journal, 42, 1, 2006, 47-61.

7.  Sadchikov A.P.: Ecology of coastal-water vegetation (training manual for students of high
     schools. Publishing house NIА-Priroda, REFIA 2004.